Question

A current of $0.6A$ produces a deflection of ${30}^{\circ }$ in tangent galvanometer. What current will produce deflection of ${60}^{\circ }$.

• A. $1.2A$
• B. $1.8A$
• C. $2.4$
• D. $3.0A$

Answer 1

The correct option is A $1.2A$

In tangent galvanometer

$i=kTan\theta$

Where $k$ is proportionality constant.

So, $0.6=kTan30$

$k=0.6\sqrt{3}$

$i=0.6Tan60$

And $i=0.6\sqrt{3}.\sqrt{3}$

$i=1.8A$.

So correct answer is option $B$.